As one say creation for "the act of creating something", couldn't the word edition mean "the act of changing something"? I was under the impression it was the case. But a remark from one of my colleagues, telling me I should use editing instead, prompted me to check on Wiktionary. As it turned out, I didn't find the meaning I searched under the definitions. Note that my colleague and I both are not native speakers. So which of us is right?
Your colleague is correct. Though it would make sense for edition to mean editing, it has come only to mean the result of the editing (e.g. second edition) or the format of the finished work (e.g. leather-bound edition).
It would be better to use editing or revising.
I would recommend the term "emendation" for this purpose.
For example: "Emendation of the injured text was made to restore sense."
The advantage of using "emend" in this way is that it is often more value-neutral, where "edit" has a somewhat critical nuance that may be unwanted.